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Q.E.D. or QED is an initialism of the Latin phrase quod erat demonstrandum, meaning "that which was to be demonstrated". Literally, it states "what was to be shown". [ 1 ] Traditionally, the abbreviation is placed at the end of mathematical proofs and philosophical arguments in print publications, to indicate that the proof or the argument is ...
quod erat demonstrandum "that which was to be demonstrated" [1] Cited in many texts at the end of a mathematical proof. Example: "At the end of the long proof, the professor exclaimed ' QED! '" q.v. qq.v. quod vide quae vide "which see" Imperative, [1] used after a term or phrase that should be looked up elsewhere in the current document or book.
quod erat faciendum (Q.E.F.) which was to be done: Or "which was to be constructed". Used in translations of Euclid's Elements when there was nothing to prove, but there was something being constructed, for example a triangle with the same size as a given line. quod est (q.e.) which is: quod est necessarium est licitum: what is necessary is lawful
Q.E.D. (quod erat demonstrandum), used at the end of a mathematical proof; Quantum electrodynamics, a field in particle physics; QED manifesto and project, a database of mathematical knowledge; QED: The Strange Theory of Light and Matter, a 1985 physics book by Richard Feynman
Varro (116 BC – 27 BC), in the opening line of the first book of Rerum Rusticarum Libri Tres, wrote quod, ut dicitur, si est homo bulla, eo magis senex (for if, as they say, man is a bubble, all the more so is an old man) [7] later reintroduced by Erasmus in his Adagia, a collection of sayings published in 1572. homo homini lupus: man [is a ...
"quod erat demonstrandum" "what was required to be proved" Used by early mathematicians including Euclid (Elements, 1.4), Aristotle (APo.90b34), and Archimedes, written at the end of a mathematical proof or philosophical argument, to signify the proof as complete. Later it was latinized as "QED" or the Halmos tombstone box symbol.
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esto quod es: be what you are: Motto of Wells Cathedral School: et adhuc sub iudice lis est: it is still before the court: From Horace, Ars Poetica (The Art of Poetry) 1.78. et alibi (et al.) and elsewhere: A less common variant on et cetera ("and the rest") used at the end of a list of locations to denote unenumerated/omitted ones.